Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
1st Edition
ISBN: 9780078682278
Author: McGraw-Hill, Berchie Holliday
Publisher: Glencoe/McGraw-Hill
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Chapter 10.5, Problem 38E

(a)

To determine

To write: The equation of a parabola with vertex at (3,2), axis y = 2 and latus rectum 8 units long.

(a)

Expert Solution
Check Mark

Answer to Problem 38E

  (y2)2=±8(x+3)

Explanation of Solution

Given information: Critical Thinking: The Latus rectum of a parabola is the line segment through the focus that is perpendicular to the axis has endpoints on the parabola. The length of the latus rectum is |4p| units, where p is the distance from the vertex to the focus.

  Advanced Mathematical Concepts: Precalculus with Applications, Student Edition, Chapter 10.5, Problem 38E , additional homework tip  1

Calculation:

The vertex and axis give us the base formula:

  (y2)2=4p(x+3)|4p|=8p=±2

This gives us 2 options:

  (y2)2=±8(x+3)

(b)

To determine

To write: The equation of the circle, if the latus rectum of the parabola with equation (x1)2=16(y4) coincides with the diameter of a circle.

(b)

Expert Solution
Check Mark

Answer to Problem 38E

  (x1)2+y2=64

Explanation of Solution

Given information: Critical Thinking: The Latus rectum of a parabola is the line segment through the focus that is perpendicular to the axis has endpoints on the parabola. The length of the latus rectum is |4p| units, where p is the distance from the vertex to the focus.

  Advanced Mathematical Concepts: Precalculus with Applications, Student Edition, Chapter 10.5, Problem 38E , additional homework tip  2

Calculation:

  4p=16|4p|=|16|

Since the vertex of the parabola is (1,4) and downward facing, this puts the center of the circle at (1,0)

  Advanced Mathematical Concepts: Precalculus with Applications, Student Edition, Chapter 10.5, Problem 38E , additional homework tip  3

Since the latus rectum is 16 long, this makes the radius of the circle 8.

This gives the equation:

  (x1)2+y2=64

Chapter 10 Solutions

Advanced Mathematical Concepts: Precalculus with Applications, Student Edition

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Finding The Focus and Directrix of a Parabola - Conic Sections; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=KYgmOTLbuqE;License: Standard YouTube License, CC-BY